Alchemy 1.0 PPTP VPN only passing certain types of traffic.

After connecting w/ XP over VPN to my linksys, I am only able to do a few network actions on the linksys LAN. I can ping, http over any port, pull up a microsoft share list on a computer, but I am not able to access a shared folder, or use any remote software, such as VNC or DameWare.

I imagine there is some sort of routing issue--TCP vs. UDP, or some firewall issues?

Yup, I am seeing 95% CPU Utilization with a client connected, but with no data xferring. Why does an idle connection require that much computation? If an idle connection requires 95%, how is this being offered as a feature?

Is this a configuration issue, or are we just asking to much of this processor?